**Photon Emission from Circular Equatorial Orbiters around Kerr Black Holes**

We consider monochromatic and isotropic photon emission from circular equatorial Kerr orbiters. We calculate the critical curve delineating the region of photon escape from that of photon capture in each emitter’s sky, allowing us to derive analytic expressions for the photon escape probability and the redshift-dependent total flux collected on the celestial sphere as a function of emission radius and black hole parameters. This critical curve generalizes to finite orbital radius the usual Kerr critical curve and displays interesting features in the limit of high spin. These results confirm that the near-horizon geometry of a high-spin black hole is in principle observable.

Host: Klaountia Pasmatsiou

Zoom meeting ID: 999 3023 4812

For the password to access the meeting please contact one of us:

Kurt Hinterbichler: kjh92

Kara Farnsworth: kmf137

Ellen Rabe: exr223

Idit Zehavi: ixz6

at case.edu